(This might be a wikidot thing and impossible/very difficult for the SCP staff to do, but I think it's worth a mention)

So basically, instead of bumping things and replying to people to post thanks or that somethings unhelpful or just to quickly put down that you liked what someone said, I think it would be pretty useful to be able to vote on forum posts with things like

[Thank/I Like This] [Dislike] [Helpful] [Funny] [Unhelpful]

and etc. I think this will help indicate if feedback is good feedback or bad, it will just leave something to tell the poster know you thought what he posted was funny (Let's say he put in a joke along within a critique) and so on.

Not necessarily. People might still game the system if this feature was possible—someone who reacts badly to negative feedback might mark posts by that reviewer as unhelpful regardless of content, people who are unfamiliar with what constitutes "good" and "bad" feedback might just mark everything good to make everyone happy, some people might just mark things "good" if they're positive feedback. And so on and so on.

I personally am fine with people posting "Yeah, [this person]'s feedback is good, because [reason], which can also be seen in [example of successful piece]" or the like. It shows that there was at least some comprehension of the content of the piece, and it fosters collaboration in the future. You start to remember others' names more often if you use them while in discussion.